我们的应用程序有多个在大多数情况下只和数据库“A”打交道的服务层方法；它们偶尔也会从数据库“B”中获取只读数据。
Our application has several service layer methods which only deal with database “A” in most instances; however occasionally they also retrieve read-only data from database “B”.
通过在FrameworkManager中描述一个元数据层，来自大部分数据库和其他来源(比如web服务)的数据在Cognos报告中都可以被访问。
Data from most databases and other sources, such as Web services for example, can be accessed in Cognos reports by describing a metadata layer in Framework Manager.
学习如何在数据库中生成feed和Web服务，在应用程序层查询和组合它们，然后在客户机浏览器中显示它们。
You'll learn how feeds and Web services are generated in the database, queried and combined in the application layer, and then presented in the client browsers.
服务层上有一个方法设计在两个数据库上执行数据变更。
The service layer does have one method involving data changes on both databases. Here is the pseudo-code.
例如，在Cognos报告中，可以通过在FrameworkManager中描述一个元数据层，来访问大多数数据库和其他数据源，例如Web服务中的数据。
Data from most databases and other sources, like Web services, can be accessed, for example, in Cognos reports by describing a metadata layer in Framework Manager.
例如，在数据存储库层，登台数据库和存储库数据库可以在不同的服务器上、在同一服务器上或者甚至在不同模式下的同一数据库中。
For example, in the data repository tier, staging and repository databases can be on different servers, on the same server, or even in the same database under different schemas.
以这种方式编写我们的查询可以最小化数据库和应用程序服务器层之间传输的数据总量。
Writing our query in this manner minimizes the amount of data transferred between the database and application server tiers.
让数据集跨越不同的服务器需要在应用程序层做大量工作，比如跨两个数据库联结列并确保数据是一致的。
To split your dataset across different servers requires a lot of work at the application level, such as joining columns across two databases and making sure data is consistent.
这些服务定义并使用数据操作层元数据，例如各个数据库位置、模式、规则、连接、用户ID和密码等等。
They define and use the data manipulation layer metadata, such as various database locations, schemas, rules, connections, user IDs and passwords, and so on.
清单3给出包含两个服务器组的数据库层的xml片段。
Listing 3 shows XML fragment for a database tier with two server groups.
数据库层上面的一层常常称为游戏引擎(或游戏服务器)。
On top of that is a layer commonly called the game engine (or game server).
数据服务器层是数据网格的组成部分，通过在内存中缓存对象来缓冲数据库访问，以实现更高的性能。
Data Server tier, part of data Grid, buffers database access by caching objects in-memory for higher performance.
再下面一层是配置memcached实例的地方 — 即应用服务器与数据库服务器之间。
The next layer is where I configure my memcached instances — between the application servers and the database servers.
例如，基于mysql集群的数据库层可能包含两个服务器组，一个ndbd组和一个manager组。
For example, a mysql-cluster-based database tier would be comprised of two server groups, an NDBD group and a manager group.
该示例应用程序通过服务层从两个层访问数据库，以演示如何在这两个层中使用Spring。
The sample application accesses the database through the service layer from both tiers to demonstrate how we use Spring in both of them.
控制器由一个servlet提供，该servlet运行在嵌入式JettyWeb服务器中，而Derby数据库则充当后端，表示该应用程序的模型层。
The controller is provided by a servlet that runs in the embedded Jetty Web server, and the Derby database ACTS as the back end and represents the model layer for the application.
在开发Web应用程序时，为逻辑层和ui层创建放置服务器端代码的数据库结构是一种标准实践。
When developing a Web application, it's standard practice to create a database structure on which server-side code is placed for the logic and UI layers.
接下来让我们看一个常见的三层应用程序环境示例：Web、应用服务器和数据库服务器。
Let's use an example of a common three-tier application environment: Web, application server, and database server.
在 Discussion数据库模板上设计Web服务层以公开关键模板功能供 Web 服务客户机使用。
Engineer a Web service layer on the Discussion database template to expose the key template functionality for consumption by a Web service client.
如果用Web服务器运行某种脚本语言(比如php)，从而连接数据库，那么这可以看作两层。
If you then had a scripting language running in-process with the Web server, such as PHP, that connected to a database, this would be described as two tier.
通过允许Web服务器直接访问包含动态内容的其他数据资源(比如数据库)，2层Web架构可以满足这些需求。
The 2-tier Web architecture addressed these requirements by giving Web servers direct access to other data resources (such as a database) that provide dynamic content.
为了连接db 2或Cloudscape数据库服务器，PHP的统一odbc扩展需要依赖DB 2客户机的调用级接口(Call Level Interface,cli)层。
To connect to a DB2 or Cloudscape database server, the Unified ODBC extension for PHP relies on the Call Level Interface (cli) layer of the DB2 client.
当按照以上描述完成配置之后，Derby数据库使应用程序服务器层与eis层之间的差别模糊化。
When configured as described above, the Derby database engine blurs the distinction between the Server tier and the EIS tier.
前一节中的示例有三层，即前端Web服务器、应用服务器和数据库。
The example from the previous section has three tiers, which are the front-end Web server, the application server, and the database.
每个产品都划分为多个层：数据库层、应用程序层和Web服务器层。
Each product was divided into tiers: a database tier, an application tier, and a Web server tier.
它是一个分布式的内存缓存系统，Facebook(包含其他很多网站)用它作为Web服务器和MySQL服务器之间的缓存层(因为数据库访问相对比较慢)。
It's a distributed memory caching system which Facebook (and a ton of other sites) use as a caching layer between the web servers and MySQL servers (since database access is relatively slow).
Servoy环境采用一个n层架构，该架构包括跨数据库支持、高级应用程序服务器以及呈现层中的各种部署选项。
The Servoy environment employs an n-tier architecture which includes cross-database support, and advanced application server, and a variety of deployment options in the presentation layer.
全冗余的整体架构主机层：使用服务器虚拟化，数据库集群等保障业务的连续性。
The full redundancy of the overall architecture of the host layer: the use of server virtualization, database clusters and other services to ensure continuity.
重点介绍了基本服务的实现、数据库层的实现、工作流引擎的实现及原理以及与帐务、授信、SWIFT等系统的接口实现。
Introduced with emphasis the basic service, the database level realization, the elements and realization of the workflow engine, as well as the interfaces of accounting, crediting and SWIFT systems.
系统采用SQLSERVER数据库作为数据层的服务器，应用服务器使用数据库连接池和SQL语句来与SQLSERVER交互。
The system use SQLSERVER database as data-layer, Application server use database-connect-pool and SQL language to communicate with SQLSERVER database.
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